I feel weird asking this, but I have to know. People frequently use "figures of speech" for example; I heard through the grape vine, right from the horses mouth or it's raining cats and dogs. Does anyone wonder why they use those analogies and not something that makes more sense? Why a grape vine, what's so special about a grape vine or why cats and dogs? I understand the premise behind the analogy because growing up I heard them frequently, but they sound ridiculous.
Figures of speech: I feel weird asking this... - Autism Support
You know what? I've been curious about those too. I usually google them and get some good stories about how they came to be. Like, if I remember, Raining Cats and Dogs has something to do with cats and dogs having been on the roof of a thatched house and when it rains really hard they would come through? Please don't quote that! But since you're bound to have more questions about other figures of speech, I recommend Urban Dictionary. Google is my friend.